Front cylinder-head for rock-drills.



No. 747,015. PATENTED DEC. 15, 1903. J. S. SPENCER. I FRONT CYLINDERHEAD TOR ROCK D-RILLS.

PPPP IGATION FILED AUG. 19, 1903.

W/ TNESQES: IN VE N TOR s fi/gwwwm f Niirnn starts Patented December 15,1903.

Patent tries.

JOHN STOOKDALE SPENCER, OF ORIPPLEOREEK, COLORADO, ASSIGNOR OF ONE-THIRDTO JAMES M. WRIGHT, OF ORIPPLEOREEK, COLORADO.

FRONT CYLlNDER HEAD FOR ROCK DRILLS.

S PEGIFIGA'IION forming part of Letters Patent No. 747,015, datedDecember 15, 1903.

Application filed August 19, 1903. Serial No. 170,060. I (No model.)

To all whom it may concern:

Be it known that I, JOHN STOOKDALE SPEN- OER, a citizen of the UnitedStates, and a resident of Oripplecreek, in the county of Teller andState of Colorado, have invented a new and Improved Front Cylinder-Headfor Rock- Drills, of which the following is a full, clear, and exactdescription.

The invention relates to rock-drills driven by compressed air, steam, orother fluid; and its object is to provide a new and improved frontcylinder-head arranged for convenient, quick, and secure attachment toand easy removal from the cylinder without disturbing the other parts ofthe machine.

The invention consists of novel features and parts and combinations ofthe same, as will be more fully described hereinafter and then pointedout in the claims.

A practical embodiment of the invention is represented in theaccompanying drawings, forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts inall theviews.

Figure 1 is a front elevation of the improvement as applied and showingthe head partly removed. Fig. 2 is a sectional plan View of the same'onthe line 2 2 of Fig. 1. Fig. 3 is an enlarged front elevation of thebody member of the improvement. Fig. sis a sectional plan view of theimprovement on the line 4 4. of Fig. 1, and Fig. 5 is a longitudinalsectional elevation of the improvement as applied and in position on thecylinder-head.

The cylinder-head shown in the drawings consists, essentially, of a bodymember A, a closing member B, and keys 0 for firmly uniting the members,as hereinafter more fully described. The cylinder-head is formed with alongitudinal bore for the passage of a piston-rod D, and the saidcylinder-head is preferably made conical and provided on its base orinner end with an annular oifset E, fitting a corresponding recess inthe front end of a cylinder F, as plainly shown in Fig. 5, and in orderto securely hold the cylinder-head in position on the cylinder F theside bolts Gr thereof engage open ears H, formed integrally on the sidesof the body member A at or near the base end thereof. The pistonrod borein the cylinder-head is partly formed in the body member A and partly inthe closing member B, and theisaid body member A is formed with alongitudinally-extending slot or recess leading to the said partial borein the body member, in which recess fits the closing member B, therecess having shoulders I on opposite sides of the bore for the innerends of the closing member B to rest on when driven by the keys O. Thekeys 0 extend transversely through lugs A and B in the members A and B,as plainly shown in Figs. 1, 2, and 4:, to securely unite the members Aand B With each other to allow the operator on the removal of the keysto take the member B out of the recess of the body member A, so that thelatter can be lifted 0d the piston-rod D without disturbing any of theparts of the machine, it being understood that the ears H are open inthe same direction as the body member A, so as to readily disengage theears H from the bolts G when it is desired to remove the body member Afrom the machine.

By reference to Fig. 1 it will be seen that in order to remove the headfrom the cylinder F the nuts on the bolts G are first loosened to allowof slipping the cylinder-head outward on the piston-rod D 'to disengagethe annular offset E from the recess in the end of the cylinder F. Whenthis has been done, the keys O are removed to allow of disengaging orremoving the member B from the member A, and the latter can now belifted off the piston-rod D. On removal of the cylinder-head, asdescribed, ready access is had to the cylinder for repair of packings,piston, and the like, as the case may be.

In replacing the piston-head on the cylinder-head the above-describedoperation is repeated, only in reverse order-that is, the member A isfirst placed in position on the piston-rod, with the ears H engaging thebolts G, and then the member B is placed in position on the member A andthe keys 0 driven home, after which the head is slipped inward to engagethe offset E with the recess in the outer end of the cylinder F. The

nuts on the bolts G are now screwed up to securely fasten thecylinder-head in position on the cylinder F.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A cylinder-head having abody member formed with alongitudinal recess, the inner portion of which is approximatelysemicircular, to fit onto the piston-rod, the outer portion being wide,and its side walls forming shoulders with the sides of the innerportion, a closing member fitting into the outer portion of the recessand seated on the said shoulders,the inner face of the closing memberbeing approximately halfround, to fit the piston-rod, and means fordriving the closing member home in the said body member, as set forth.

2. A cylinder-head having a longitudinal bore for the passage of thepiston-rod, the said head having two members, each having approximatelya half portion of the bore, one member being the body member and formedwith a longitudinal recess having straight side walls leading toshoulders on opposite sides of the bore, and the other or closing memberfitting the recess and adapted to be seated at its inner ends on thesaid shoulders, and keys transversely driven through the said members,to securely fasten the same together, as set forth.

3. A cylinder-head having a longitudinal bore for the passage of thepiston-rod, the said head having two members, each having approximatelya half portion of the bore, one member being the body member and formedwith a longitudinal recess having straight side walls leading toshoulders on opposite sides of the bore, and the other or closing memberfitting the recess and adapted to be seated at its inner ends on thesaid shoulders, keys transversely driven through the said members, tosecurely fasten the same together, and exterior ears integral on thesides of the body member, to engage the side bolts of the cylinders, thesaid ears being open in the same direction as the body member, as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

JOHN STOOKDALE SPENCER.

